TENW Transportation Engineering NorthWest

MEMORANDUM DATE:

June 22, 2014

TO:

Adam Lundberg, Principal, AML Construction

FROM:

Michael Read, PE, Principal, TENW

3803 NE 155th Street Mixed Use ăParking Impact Analysis TENW Project No. 3418 This memorandum summarizes the results of parking demand analysis associated with a proposed development known as the 3803 NE 155th Street Mixed Use project near the intersection of NE 155 Street and Ballinger Way (SR 104) intersection in Lake Forest Park, WA. Upon completion, the project would remove an existing single family home and garage, and build a mixed use building with up to 34 residential apartments, 1,340 square-feet of office, and 32 parking stalls in structured parking. An evaluation of City code, parking demand estimates based on national/local parking generation rates, and the potential for shared parking at the site is included in the evaluation of on-site parking demand. Parking Generation, 4th Edition, Institute of Transportation Engineers, and Shared Parking, 2nd Edition, Urban Land Institute to estimate peak on-site demand for parking by use and hourly utilization profiles for a typical weekday. SUBJECT:

Project Description The proposed mixed use project is located at 3803 NE 155th Street, adjacent to the Sheridan Market east of Ballinger Way (SR 104), is proposing up to 34 apartment units and 1,340 squarefeet of office uses. No on-street parking is available in the immediate site vicinity. A conceptual site design in Figure 1.

Parking Analysis A parking analysis was conducted to project parking impacts. The analysis included:    

City of Lake Forest Park parking requirements. Proposed on-site parking supply. Estimated parking demand and utilization of proposed mixed use development. Mitigation measures.

City of Lake Forest Park Parking Requirements Based upon City of Lake Forest Park off-street parking standards (Municipal Code 18.58.030 and 18.47.110), Table 1 summarizes minimum off-street parking stalls required. As this project is within the Southern Gateway Subarea, separate code provisions apply. As shown, the City of Transportation Planning | Design | Traffic Impact & Operations PO Box 65254, Seattle, WA 98155 | Office (206) 361-7333

Parking Demand Analysis 3803 NE 155th Street Mixed Use

FIGURE 1 – CONCEPTUAL SITE PLAN

TENW

June 22, 2015 Page 2

Parking Demand Analysis 3803 NE 155th Street Mixed Use

Lake Forest Park would normally require 49 off-street parking stalls for the proposed residential and non-residential uses. Table 1 3803 NE 155th Street Off Street Parking Requirements Parking Component Residential Uses Office Uses

Minimum Off-Street Parking Requirements

Size

Total

1.25 stalls per Multifamily Dwelling

34 units

43 stalls

1 stall per 250 Square-Feet

1,340 SF

6 stalls

Total Minimum Off-Street Parking Supply

49 stalls

1 - Per City of Lake Forest Park Municipal Code, 18.47.110.

Project Parking Demand and Proposed Supply The Institute of Transportation Engineers Parking Generation, Fourth Edition, 2010, was used to estimate potential parking demand for the proposed 3803 NE 155th Street Mixed Use development. Land Use Code 221 for Low/Mid-Rise Apartments and Land Use Code 710 for Office were used to estimate parking demand (see Attachment A). Without considering shared use, total peak demand for parking is estimated at up to 35 stalls, which assumes both proposed land uses peak simultaneously. However, as this is a predominately residential project, the peak demand for parking would occur during evening hours when residential demand is at its peak. During peak evening hours (after 9:00 p.m.), peak demand for on-site parking is estimated at 31 stalls, while during typical weekday daytime hours during normal business hours, peak on-site parking demand is estimated at 26 stalls when residential demand is reduced and office uses are at their peak. Hourly parking profiles by land use published in Shared Parking, 2nd Edition, Urban Land Institute, were used to a evaluate shared parking scenario.

Conclusions The proposed 3803 NE 155th Street Mixed Use development was evaluated for peak parking demands. City code would normally require 49 on-site parking stalls to be provided. Peak parking demand was estimated using published ITE parking rates and evaluated for peak daytime and evening demands. To accommodate the proposed project of up to 34 apartments and 1,340 square-feet of office, an additional 7 on-site stalls are recommended. To maximize density of the site, up to 35 apartment units with 1,340 square-feet of office could be developed and accommodated within the 32 stalls available of the proposed parking garage. If you have any questions regarding the information presented in this memo, please call me at (206) 361-7333 x 101 or [email protected].

TENW

June 22, 2015 Page 3

Attachment A Parking Demand Estimates

3803 NE 155th Street Mixed Use ‐  Parking Demand Analysis

ITE Parking Generation ‐ 4th Edition Demand Time Low‐Rise/Mid‐Rise Apts

221

Office Use

701

Demand Rate

Peak Period Parking  11:00 p.m. ‐ 6:00 a.m. Demand Peak Period Parking  9:00 a.m. ‐ 4:00 p.m. Demand

0.92 2.84

ITE Demand

Unit stalls per  34 dwelling unit stalls per 1,000  1.34 square feet

dwelling  units square  feet

Total

Daytime Peak Parking Demand

31 4

35

Peak Evening Demand (Residential Only) On‐Site Stalls

31 32

Residential (70% of peak evening rate) Office Total

22 4 26

On‐Site Stalls

32